/// <summary>
/// Creates a new <see cref="ShibbolethToken"/> from the current values of the HTTP server variables.
/// </summary>
/// <returns></returns>
public static ShibbolethToken CreateCurrent()
{
// Get all server variables.
NameValueCollection vars = HttpContext.Current.Request.ServerVariables;
// Create a new token and set its properties using the attached ServerVariable attributes.
ShibbolethToken token = new ShibbolethToken();
PropertyInfo[] properties = token.GetType().GetProperties();
foreach (PropertyInfo property in properties)
{
ServerVariableAttribute attr = property.GetCustomAttribute <ServerVariableAttribute>();
if (attr != null)
{
string value = vars[attr.Name];
if (!String.IsNullOrEmpty(value))
{
property.SetValue(token, value);
}
}
}
return(token);
}
/// <summary>
/// Creates a new <see cref="ShibbolethToken"/> from the current values of the HTTP server variables.
/// </summary>
/// <returns></returns>
public static ShibbolethToken CreateCurrent()
{
// Get all server variables.
NameValueCollection vars = HttpContext.Current.Request.ServerVariables;
// Create a new token and set its properties using the attached ServerVariable attributes.
ShibbolethToken token = new ShibbolethToken();
PropertyInfo[] properties = token.GetType().GetProperties();
foreach( PropertyInfo property in properties )
{
ServerVariableAttribute attr = property.GetCustomAttribute<ServerVariableAttribute>();
if( attr != null )
{
string value = vars[ attr.Name ];
if( !String.IsNullOrEmpty( value ) )
{
property.SetValue( token, value );
}
}
}
return token;
}
public static ElmsRegistrationResult Register( ShibbolethToken token )
{
// Input validation.
if( token == null )
{
Log.WriteError( "ElmsHelper.Register: token is null!" );
throw new ArgumentNullException( "token" );
}
if( String.IsNullOrEmpty( token.Email ) )
{
Log.WriteError( "ElmsHelper.Register: token.Email is null!" );
throw new ArgumentException( "The e-mail address is required for the registration!" );
}
// Prepare the constant parameters.
string accountNumber = ConfigHelper.Elms.AccountNumber;
string key = ConfigHelper.Elms.Key;
// Prepare the user-specific parameters.
string userName = HttpUtility.UrlEncode( token.Email );
string email = HttpUtility.UrlEncode( token.Email );
// Prepare the parameter that describe the user's permissions.
List<string> statusList = new List<string>();
if( token.IsStudent )
{
statusList.Add( ElmsHelper.StudentStatus );
}
if( token.IsSupervisor )
{
statusList.Add( ElmsHelper.StaffStatus );
statusList.Add( ElmsHelper.FacultyStatus );
}
string statuses = String.Join( ",", statusList );
// Build the request URL.
string serviceUrl = String.Format( CultureInfo.InvariantCulture, "{0}?account={1}&key={2}&username={3}&academic_statuses={4}&email={5}", ElmsHelper.RegistrationUrl, accountNumber, key, userName, statuses, email );
// Integrity check: the built URL must be a valid URI.
Uri serviceUri;
if( !Uri.TryCreate( serviceUrl, UriKind.Absolute, out serviceUri ) )
{
Log.WriteError( "ElmsHelper.Register: Invalid ServiceURL: {0}", serviceUrl );
throw new InvalidOperationException( "The service URL is invalid!" );
}
// Send the HTTP GET request to the ELMS WebStore.
ElmsRegistrationResult result = new ElmsRegistrationResult();
try
{
// NOTE: This low-level class must be used, becuase the WebClient class does not provide access to the HTTP status code.
HttpWebRequest request = (HttpWebRequest) WebRequest.Create( serviceUri );
using( HttpWebResponse response = (HttpWebResponse) request.GetResponse() )
{
result.StatusCode = response.StatusCode;
// Check the HTTP status code.
if( response.StatusCode == HttpStatusCode.OK )
{
using( StreamReader reader = new StreamReader( response.GetResponseStream() ) )
{
// Read the raw content from the HTTP response.
string responseText = reader.ReadToEnd();
// Check that the raw content of the HTTP response is a valid absolute URL.
Uri responseUri;
if( Uri.TryCreate( responseText, UriKind.Absolute, out responseUri ) )
{
result.IsSuccess = true;
result.RedirectUri = responseUri;
}
}
}
}
}
catch( WebException ex )
{
// Log the error.
Log.WriteError( ex );
Log.WriteError( "ElmsHelper.Register: WebException! ServiceURL: {0}", serviceUrl );
HttpWebResponse response = ex.Response as HttpWebResponse;
if( response != null )
{
Log.WriteError( "ElmsHelper.Register: WebException! StatusCode: {0}", response.StatusCode );
Log.WriteError( "ElmsHelper.Register: WebException! StatusDescription: {0}", response.StatusDescription );
}
// Treat the registration unsuccessful in case of any error.
result.IsSuccess = false;
}
catch( Exception ex )
{
// Log the error.
Log.WriteException( ex );
// Treat the registration unsuccessful in case of any error.
result.IsSuccess = false;
}
return result;
}
